64646972 has 12 divisors (see below), whose sum is σ = 121834776. Its totient is φ = 29837040.

The previous prime is 64646963. The next prime is 64646993. The reversal of 64646972 is 27964646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621554 + ... + 621657.

It is an arithmetic number, because the mean of its divisors is an integer number (10152898).

Almost surely, 2^64646972 is an apocalyptic number.

It is an amenable number.

64646972 is a deficient number, since it is larger than the sum of its proper divisors (57187804).

64646972 is a wasteful number, since it uses less digits than its factorization.

64646972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243228 (or 1243226 counting only the distinct ones).

The product of its digits is 435456, while the sum is 44.

The square root of 64646972 is about 8040.3340726614. The cubic root of 64646972 is about 401.3433418646.

The spelling of 64646972 in words is "sixty-four million, six hundred forty-six thousand, nine hundred seventy-two".